<wicket:panel xmlns:wicket="http://wicket.apache.org">
  <div class="card">
    <div wicket:id="tabs-container" class="card-header">
      <ul class="nav nav-tabs card-header-tabs">
        <li wicket:id="tabs" class="nav-item"><a href="#" class="nav-link" wicket:id="link"><span wicket:id="title">[[tab title]]</span></a></li>
      </ul>
    </div>
    <div wicket:id="panel" class="card-body"><!-- no panel --></div>
  </div>
</wicket:panel>